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Wittaler [7]
3 years ago
10

I need help answering this question for trig equations. Sec^2x+4secx=-4

Mathematics
1 answer:
aliina [53]3 years ago
3 0

Answer:

x = 120°

Step-by-step explanation:

We are given;

sec²x + 4secx = -4

Rearranging gives;

sec²x + 4secx + 4 = 0

Factorizing the left hand side gives;

(sec x + 2)(sec x + 2) = 0

This means that;

(sec x + 2) = 0

From trigonometry, we know that sec x = 1/cos x

Thus;

(1/cos x) + 2 = 0

1/cos x = -2

cos x = -1/2

cos x = -0.5

x = cos^(-1) -0.5

x = 120°

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Step-by-step explanation:

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3 years ago
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For each rectangle below, write a linear equation that represents the area y of the rectangle. Solve this system of two linear e
Hatshy [7]

(5,24)

  • The two areas are the same.

  • To find the area, we multiply the side lengths. Y=area

Rectangle 1: side lengths 4 and (x+1)

y=4(x+1)= 4x+4

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I graphed the linear equation on desmos.

5 0
2 years ago
Select the coordinate point that is a solution of equations. 2x+y=7; 3x-4y=5
grandymaker [24]

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D (3,1)

Step-by-step explanation:

solving simultaneous equations

Arrange equations

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3x-4y=5

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4{2x+y=7}

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4 0
4 years ago
Read 2 more answers
Help is appreciated ty!!
Ket [755]

Answer:

B and C

Step-by-step explanation:

Jane found multiples of 8 instead of factors and should've gotten 1, 2, 4, and 8 as her answer.

Hope this helps :)

5 0
2 years ago
Read 2 more answers
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